Smaller crowds challenge Putin

•January 1, 1970

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Russian opposition leader Alexei Navalny, center, stands among the other protesters during a rally in Moscow, Russia, Saturday, March 10, 2012. The demonstrators gathered in central Moscow to protest electoral fraud. Saturday's rally is widely seen as evidence of whether the opposition is able to maintain its strength after Vladimir Putin on Sunday won a return to the Kremlin. (AP Photo/Ivan Sekretarev)

Thousands of Russians chanting "Time for change" challenged Vladimir Putin's presidential election victory on Saturday but their numbers were far fewer than in previous weeks.